CVE-2025-0684
Full vulnerability record from the local CVENow database.
Description
A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections.
Severity
MEDIUM
CVSS score
6.4
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2025-03-03 18:15:30.537000
Last modified
2026-10-21 17:17:27.380000
View original CVE JSON
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"sourceIdentifier": "[email protected]",
"published": "2025-03-03T18:15:30.537",
"lastModified": "2026-10-21T17:17:27.380",
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"value": "A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_reiserfs_read_symlink() will call grub_reiserfs_read_real() with a overflown length parameter, leading to a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution, by-passing secure boot protections."
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"value": "Se encontró una falla en grub2. Al realizar una búsqueda de enlace simbólico desde un sistema de archivos reiserfs, el módulo de sistema de archivos reiserfs de grub utiliza parámetros controlados por el usuario de la geometría del sistema de archivos para determinar el tamaño del búfer interno; sin embargo, verifica incorrectamente si hay desbordamientos de enteros. Un sistema de archivos manipulados con fines malintencionados puede provocar que algunos de esos cálculos de tamaño de búfer se desborden, lo que hace que realice una operación grub_malloc() con un tamaño menor al esperado. Como resultado, grub_reiserfs_read_symlink() llamará a grub_reiserfs_read_real() con un parámetro de longitud desbordado, lo que lleva a una escritura fuera de los límites basada en el montón durante la lectura de datos. Esta falla puede aprovecharse para corromper los datos críticos internos de grub y puede resultar en la ejecución de código arbitrario, eludiendo las protecciones de arranque seguro."
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